function draw_weights(quant_centers_targ, weights, survey)
global SUBPLOTS_X;
global SUBPLOTS_Y;
global g_survey_num;

subplot(SUBPLOTS_X, SUBPLOTS_Y, 2);
color_ = survey / g_survey_num;
color = [color_, 1-color_, 0];

stem3(real(quant_centers_targ), imag(quant_centers_targ), weights, ...
    '^', 'fill', 'color', color);
zlabel('W(v^*, phi_v^*)'); xlabel('x'); ylabel('y');
hold on;

end
